<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>仿新浪网“返回顶部”效果</title>
<meta http-equiv="content-type" content="text/html;charset=UTF-a8">
<style type="text/css">
.backToTop {
	 display: none;
	 width: 18px;
	 line-height: 1.2;
	 padding: 5px 0;
	 background-color: #000;
	 color: #fff;
	 font-size: 12px;
	 text-align: center;
	 position: fixed;
	 _position: absolute;
	 right: 10px;
	 bottom: 100px;
	 _bottom: "auto";
	 cursor: pointer;
	 opacity: .6;
	 filter: Alpha(opacity=60);
}
</style>
<script type="text/javascript" src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js"></script>
</head>
<body>
<p>如果预览时左下角提示错误，<font color=red>请先刷新一下本页面</font>就可以看到效果了。</p>
<p>  拖动滚动条到页面底部就会显示“返回顶部”按钮。</p>
<p> 更多代码请访问：<a href="http://www.lanrentuku.com/" target="_blank">懒人图库</a></p>
<p></p>
<div style="height:2000px;"></div>
<script type="text/javascript">
(function() {
    var $backToTopTxt = "返回顶部", 
	$backToTopEle = $('<div class="backToTop"></div>').appendTo($("body"))
        .text($backToTopTxt).attr("title", $backToTopTxt).click(function() {
            $("html, body").animate({ scrollTop: 0 }, 120);
    }), $backToTopFun = function() {
        var st = $(document).scrollTop(), winh = $(window).height();
        (st > 0)? $backToTopEle.show(): $backToTopEle.hide();
        //IE6下的定位
        if (!window.XMLHttpRequest) {
            $backToTopEle.css("top", st + winh - 166);
        }
    };
    $(window).bind("scroll", $backToTopFun);
    $(function() { $backToTopFun(); });
})();
</script>
</body>
</html>